New to the board, though not to AUdi. Issue, recent cold snap, heating issues. Symptom: With all temp gauges at proper levels (coolant mid dial, Oil temp 1/4 + from the left) my Climate control is blowing warm to cool. No residue inside car (from coolant contamination), no smells, just not much heat (even when set on "HI"). My thought was (god forbid) heater core . . . but no smell, no residue. Then, control head . . . but all controls on the panel (save the actual temp delivered) are acting normally. Is there a self test sequence for the system?

The only tests of the system i know involve a scan tool like vag com. Basically running the system through a series of output tests.

Imperially it sounds like the mixer. The blower system is right behind the glove box. Its super easy to get to. do you hear the normal sounds of the mixer flaps moving when you move temp from high to low or change output vents?